Malicious PDF — malware analysis report

Static analysis result for SHA-256 313225368fd9b4e1…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 01:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9fc73965a22d03d06843d5b3c8963cf0 SHA-1: 0899a58384e9cab1081b5a0a6fa5355c4a5738ec SHA-256: 313225368fd9b4e1970bc22fb358260b7bc10a9d8ba67d6e9f8beb43067053bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=rapunzel+a+princess+frozen+in+time+full+movie PDF link annotation
    • http://www.allatpatikapecs.hu/images/file/32587199336.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2851a61f0044dde974cde8f9bd094da6/7361807877.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/64070564913.pdfIn PDF document text
    • http://hk-keber.de/images/file/3841854821.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/72032364111.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/71797024589.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/devixuposositetikusiwu.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/65719853560.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/32462655939.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/gisevi.pdfIn PDF document text
    • https://bagstyle.uz/images/file/13591736897.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/51483576933.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/fevumizukoduf.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/16338492668.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/lenilanoliruwirugitujobe.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/60862111589.pdfIn PDF document text
    • http://rts-3.ru/upload/files/36915873337.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/zubivexivovikukuwe.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/53534286804.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/36888921116.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/897f56fecdd1ed648cf85460981eb588/gadelatunakunoxozes.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/zokunaxedusojuzi.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/zafakavobanelusona.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/76850189951.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/95101812766.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444445ade5b---93563609462.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/33573847268.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 10912 bytes
SHA-256: 14e45417cfa0aa829404336297e3a8ba6d35d82ecd5011814060b1df8c077df6
font_01_sfnt_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 17608 bytes
SHA-256: d616de3c20bfa4461ec4fcd7a3aa777926771e72f968a7a4ef78a2113e1a49ad
font_02_sfnt_off00012ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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